Table 1. Classification of individual BAT detection areas in the thorax.
| All subjects | Male subjects | Female subjects | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Supraclaviculararea(s) | - | + | + | - | - | + | + | - | - | + | + | - | ||||||
| Mediastinalarea(m) | - | - | + | + | - | - | + | + | - | - | + | + | ||||||
| Class 1 | none | s − m | s + m | m—s | none | s − m | s + m | m—s | none | s − m | s + m | m—s | ||||||
| Number | 1494 | 7 | 29 | 20 | 843 | 1 a | 11 | 3 a | 651 | 6 a | 18 | 17 a | ||||||
| Year of age | 59 (52/68) | 55 (50/64) | 48 (42.5/55) * † | 54 (43/60.5)* | 59 (52/68) | 50 (50/50) | 47 (37/55) * | 38 (37/50) * | 58 (51/67) | 59.5 (50.5/67) | 48 (42.8/56)* † | 57 (44.5/62.5) | ||||||
| Body mass index (BMI) (kg/m 2) | 23.3 (20.9/25.6) | 21.3 (17.3/24.4) | 21.5 (19.3/23.1) * | 21.3 (20.8/25.6) | 24.1 (21.8/26.2) | 16.5 (16.5/16.5) | 22.1 (21.2/23.3)* | 25.6 (20.4/26.9) | 22.2 (20.3/24.5) | 22.7 (19.1/24.9) | 20.4 (18.4/22.5)* | 21.1 (20.9/24.5) | ||||||
| Ambient temperature (°C) | 17.5 (10.2/24.6) | 24.1 (17/25.9) | 7.4 (4.6/12.3)* † | 8.5 (4.78/12.4)* † | 17.9 (10.7/24.7) | 15.2 (15.2/15.2) | 5.9 (4.3/10.2)* | 6.5 (4.2/8.5)* | 17.3 (9.7/24.6) | 24.9 (20.5/26.3) | 10 (4.6/12.5)* † | 8.6 (4.9/14.1)* † | ||||||
| Class 2 | none | s | m—s | none | s | m—s | none | s | m—s | |||||||||
| Number | 1494 | 36 b | 20 b | 843 | 12 a | 3 a | 651 | 24 a | 17 a | |||||||||
| Year of age | 59 (52/68) | 50.5 (43/55.8) * | 54 (43/60.5)* | 59 (52/68) | 48.5 (38.5/54) * | 38 (37/50)* | 58 (51/67) | 51.5 (43.8/59)* | 57 (44.5/62.5) | |||||||||
| Body mass index (BMI) (kg/m 2) | 23.3 (20.9/25.6) | 21.4 (19.3/23.5)* | 21.3 (20.8/25.6) | 24.1 (21.8/26.2) | 21.9 (20.5/23.2) * | 25.6 (20.4/26.9) | 22.2 (20.3/24.5) | 21 (18.6/23.8)* | 21.1 (20.9/24.5) | |||||||||
| Ambient temperature (°C) | 17.5 (10.2/24.6) | 10.2 (4.7/14.9)* | 8.5 (4.7/12.4)* | 17.9 (10.7/24.7) | 6.1 (4.4/11.9) * | 6.5 (4.2/8.5)* | 17.3 (9.7/24.6) | 12.1 (5.6/21.5) * | 8.6 (4.9/14.1) * † | |||||||||
| Class 3 | none | s − m | m | none | s − m | m | none | s − m | m | |||||||||
| Number | 1494 | 7 | 49 b | 843 | 1 a | 14 a | 651 | 6 a | 35 a | |||||||||
| Year of age | 59 (52/68) | 55 (50/64) | 51 (43/57.5)* | 59 (52/68) | 50 (50/50) | 45.5 (37/52) * | 58 (51/67) | 59.5 (50.5/67) | 52 (43/59)* | |||||||||
| Body mass index (BMI) (kg/m 2) | 23.3 (20.9/25.6) | 21.3 (17.3/24.4) | 21.5 (20.3/23.5)* | 24.1 (21.8/26.2) | 16.5 (16.5/16.5) | 22.4 (21/24.1) | 22.2 (20.3/24.5) | 22.7 (19.1/24.9) | 21.1 (19.5/23.4) | |||||||||
| Ambient temperature (°C) | 17.5 (10.2/24.6) | 24.1 (17/25.9) | 8.5 (4.6/12.3)* † | 17.9 (10.7/24.7) | 15.2 (15.2/15.2) | 6.1 (4.3/8.9)* | 17.3 (9.7/24.6) | 24.9 (20.5/26.3) | 9.7 (4.6/12.6) * † | |||||||||
Numerical data, except the number of subjects, are presented as medians (first quartile/third quartile). The column “All subjects” represents both sex populations, “Male subjects” represents the male population, and “Female subjects” represents the female population. The absence of BATs is represented by the symbol “-,” and the presence of BATs by “+.” The set none indicates the subject population, wherein BATs was not detected. The set s + m indicates the subject population, wherein BATs were simultaneously detected in the supraclavicular and the mediastinal areas. The set s − m indicates the subject population, wherein BATs were detected only in the supraclavicular area. The set m − s indicates the subject population, wherein BATs were detected only in the mediastinal area.
(a) The statistical difference between numbers in both sex none groups was <0.05 using Fisher’s exact test.
(b) The difference between numbers in both sex BAT-detected groups such as s, m − s of class 2 and s − m, m of class 3 was <0.05 using Fisher’s exact test.
* p-values referring to the same sex none group were <0.05 using the Wilcoxon’s rank sum test.
† p-values referring to the same sex “s − m” group were <0.05 using the Wilcoxon’s rank sum test.